Openldap problem with correct display of characters

Hello

After create new account in phpldapadmin, on left site under ou=Users are displayed names of user. When i create new user with polish signs i get  for example : cn=testuser''.chr(hexdec('C5')).''''.chr(hexdec('82')).''

On right side everything is ok cn= testuserł

One letter is replaced to chr(hexdec('C5')).''''.chr(hexdec('82'))

Any idead how to fix it.